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arc: implement stack checking

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ARC CPU has stack checking feature that allows to trigger an exception
whenever the stack is incorrectly accessed.
This patch implements the stack_top and stack_base register updates on
context switches, and activates the Stack Checking bit of STATUS32
register when the CPU is in the context of a fiber or task.
As GCC accesses the non-yet allocated stack with frame pointer enabled,
this patch also add the omit-frame-pointer gcc flag in order to work
properly.

Change-Id: Ia9e224085a03bd29d682fb8f51f8e712f2ccb556
Signed-off-by: Alexandre d'Alton <alexandre.dalton@intel.com>
This commit is contained in:
Alexandre d'Alton 2016-03-11 18:29:14 +01:00 • committed by Anas Nashif
commit f91e55b798
9 changed files with 77 additions and 5 deletions
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3
arch/arc/include/nano_private.h
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@ -194,6 +194,9 @@ struct tcs {
#ifdef CONFIG_ERRNO
int errno_var;
#endif
#ifdef CONFIG_ARC_STACK_CHECKING
uint32_t stack_top;
#endif
};
struct s_NANO {